It helps students' thinking ability and problem-solving abilities, which help students to secure good marks not in the current class, but in all academic sessions. These notes are error-free and adhere to the CBSE standards. It also helps you to understand the topic in depth. If you refer to other questions that are not given in your NCERT book, then you will prepare yourself for the examination paper where the teacher might ask you some tricky questions. These questions help you to evaluate your knowledge and understanding of any particular chapter. Students must go through the important questions of each chapter of Science, but why? Some of the reasons for this have been listed below: Stainless steel is an important iron alloy.īenefits of Referring to the Important Questions of Class 6 - Physical and Chemical Changes Painting: Applying a layer of paint to the metal's surface stops it from coming into contact with the atmosphere once more.Īlloying: To make alloys, iron can be combined with other metals and non-metals. Galvanization: A layer of a more reactive metal, such as zinc, is deposited on the surface of iron to protect it from rust. It can be avoided in the following ways:Īpplying oil or grease on the surface inhibits the iron surface from coming into touch with the atmosphere, which prevents rusting. How can rusting of iron be prevented? Suggest and explain any three methods.Īns: Rusting is a phenomenon that occurs on the surface of a metal. Iron (Fe) + Oxygen (O₂) (from the air) + water (H 2 O) rust (iron oxide Fe 2 O 3 )ĩ. Rust starts on the surface and works its way deeper into the metal. Rust (Iron III oxide) is formed when iron combines with oxygen and water. It causes the iron article to deteriorate. The production of iron oxide from iron is referred to as rust. When it comes to oxygen and water, iron is extremely reactive. There might be the production of sound during or at the end of the reaction.Ī change in the colour of the solution may occur.Īns: The degrading of metals such as iron in response to the environment is known as rusting. Heat may be absorbed or released in the reaction. What are the indications of a chemical change?Īns: The following signs of chemical change are present: This test confirms the presence of carbon dioxide.ħ. The lime turns milky or white due to the formation of calcium carbonate. The gas produced is passed through lime water. When we combine these two salts, water along with carbon dioxide gas is formed. What happens when vinegar is added to baking soda? How do you test the gas produced?Īns: Vinegar is acidic in nature on the other hand baking soda is basic in nature. Burning magnesium ribbon is an example of a chemical shift because the product is an entirely different compound.Ħ. It is a chemically unique matter at the same time. The ashes formed look physically different in appearance from the initial reactant. Explain how burning a strip of magnesium ribbon is a chemical change.Īns: When magnesium ribbon is burned in the presence of air, it produces white ash with a dazzling white light which is known as magnesium oxide. For example, changes in the state of matter, the solubility of salt and sugar in water, and so on.ĥ. During these transitions, the matter often shifts from one state to another. What are physical changes? Give examples.Īns: Physical changes occur in a matter that does not result in the creation of a new product. The transformation is irreversible.Įxamples: Combustion, corrosion, photosynthesis etc.Ĥ. The original reactant or substance changes totally as a result of a chemical transformation. What are chemical changes? Give examples.Īns: When one or more compounds react to generate completely new products, this is referred to as a chemical change. What are physical properties? Give examples.Īns: Physical characteristics are features of a substance that may be determined based on its appearance.Įxamples: shape, size, colour, state of compound etc.ģ. Identify the following changes as physical or chemical.Ģ.
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